
Total Traffic Volume & Performance in New Castle County, Delaware
Traffic The average number of vehicles that travel each day over any road in the road network. | vehicles per day7,984 |
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Trucks The percentage of the total traffic volume composed of heavy vehicles. | 8.2% |
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Average travel time The average time of travel averaged among all vehicles traveling on the road network. | 34.7 min |
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Congestion ratio The rate at which the actual travel time exceeds free-flow travel time, averaged among all roads in the network. | 21.3% |
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Drivers’ average age Average age of residents in the geographic areas where the vehicle trips originated. | 45.5 yrs |
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Drivers’ average income Average income of residents in the geographic areas where the vehicle trips originated. | $104,645 |
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Our data shows 7,984 vehicles per day on the average road in New Castle County, Delaware, and 12,194,149 vehicle-miles traveled per day (≈4.5 billion per year) across its 1,099 miles of monitored roads. About 1 in 12 vehicles is a truck, in line with Delaware (7.8%).
The busiest roads of any county in Delaware
At 7,984 vehicles per day, the average monitored road in New Castle carries 30% more traffic than the state average of 6,126, suggesting more demand on each road - more exposure for roadside businesses, and more competition for road space. Across the whole network, that travel is about 53% of Delaware's statewide total. New Castle stands out as having the highest traffic volume in Delaware - 7,984 vehicles per day.
Journey times here (34.7 minutes on average) closely track the state level. It also posts the highest average travel time in Delaware, at 34.7 minutes.
At 22% higher than the state level, the 21.3% congestion ratio signals more pronounced congestion - crucial for traffic control improvement and logistics planning.
Highway vs. Non-Highway Traffic Analysis

Highway Traffic in New Castle County, Delaware
| Traffic | vehicles per day18,249 |
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| Trucks | 10.5% |
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| Average travel time | 40.4 min |
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| Congestion ratio | 36.6% |
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| Drivers’ average age | 45.7 yrs |
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| Drivers’ average income | $105,193 |
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A little more than half of the driving in New Castle County, Delaware happens on highways: 64% of all vehicle-miles. The average highway carries 18,249 vehicles per day, 185% more than the average non-highway road in the same area, which carries 6,398 vehicles per day.
With 32% of the road miles (353 miles in 3,654 segments), highways punch above their length, carrying 7,843,368 vehicle-miles traveled per day (≈2.9 billion per year).
That is the most highway travel volume of any county in Delaware.
The highest highway truck share of any county in Delaware
Highway truck concentration here runs 6% higher than the state average, at 10.5%. The highway traffic mix is typical for Delaware: neither freight- nor commuter-dominated.
By share, New Castle has the highest highway truck concentration in Delaware, at 10.5%. At roughly 2,334 trucks per day, New Castle carries the highest volume of highway trucks in Delaware.

Non-highway Traffic in New Castle County, Delaware
| Traffic | vehicles per day6,398 |
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| Trucks | 3.9% |
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| Average travel time | 33.8 min |
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| Congestion ratio | 19.0% |
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| Drivers’ average age | 45.2 yrs |
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| Drivers’ average income | $104,060 |
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A significant share of driving in New Castle County, Delaware, 36% of vehicle-miles, happens on local roads. The average non-highway road carries 6,398 vehicles per day.
Spread over 747 miles and 23,659 segments, 68% of the road network, local roads carry a lighter load per mile: 4,350,781 vehicle-miles traveled per day (≈1.6 billion per year). Trucks make up 3.9% of non-highway traffic, about 1 in 25 vehicles.
The highest driver income of any county in Delaware
The concentration of trucks on non-highway roads is 63% lower than on highways.
The non-highway congestion ratio of 19.0% is 30% higher than the state level, suggesting slower local mobility than the state average.
Trips here originate from the highest average driver income in Delaware, at $104,645. At 46 years, New Castle's median driver age is the lowest in Delaware.